how to make environment variables persist?

Question

For this bash script:

#!/bin/sh
export AccessToken=678
export AccessTokenSecret=wxy
export ApiKey=abc
export ApiSecret=123

How can I then ensure that printenv run at a later point in time will show these variables? That is, how are they made persistent?

Must they be added to the .bashrc file?

I would think there's a sort of "database" of environment variables which can be accessed?