Need help regarding the token refresh time

Need help regarding the token refresh time

Hello!
I have a website where a costumer can book himself a meeting via Calendly. Once the meeting is booked the costumer information is sent to the Zoho CRM and a lead is created. My website is hosted on Heroku and the Zoho CRM token which i need in order to make a POST request and create a lead is saved on Heroku as an environment variable (config var). 

Right now my problem is that I need to send a new token to Heroku before the 1 hour token time limit expires, and on Heroku every time a cofig var is updated it forces a server restart. This system is less than ideal and I was wondering if there's any solution where I won't need to update the token on Heroku so often. Is there any way to get a token that lasts more than 1 hour? Is there any work around I could implement?

Thank you.