Relevant context: Understanding access token lifespan - #5 by andsouto
It sounds like you may be looking for a use case for “offline access” in Keycloak. I would recommend checking out the Keycloak documentation on the topic for more information:
Server Administration - Offline access
Please note that offline tokens are similar to refresh tokens, but they can be used to obtain a new access token even when the user is not actively using the application. Keep in mind that offline tokens are essentially a password, so it is important to treat them with the same level of security and care as you would with any other sensitive information.