Authentication using Token With Devise Rails

Personal needs help to implement token authentication , I have already created the models, the application is working correctly, now I need to improve security. The client will send me a registration and a password, it will come in JSON , there is a method that makes a select in the bank to check if enrollment and password are true, I would like to generate a token once a day as soon as it enrolls and password are confirmed. This token will return along with the ID for the device, via JSON , and in the next operations all will be validated with that token.

This is my model that does the query

class Student < ApplicationRecord
    has_many :simulated
    has_many :proof



        #Metodo que recebe matricula e senha para validar acesso

        def sqlValidatedLogin(registration,password)
        query_student = "SELECT id, name, token registration FROM students WHERE registration = "+
        registration+" AND password = "+password
        ActiveRecord::Base.connection.execute(query_student)
        end
end

# method in controller

 def index
  student = Student.new
  return_dados = student.sqlValidatedLogin(params[:registration].to_s,params[:password].to_s)
  render :json => return_dados
  end

Access to return data

link

I'm wondering how to implement in other classes, I've read the documentation but did not understand token authentication, would someone have a configuration example with comments, or could you help me implement that?