What has been said is true. If you do not rely on ACF on the front end then you don’t really need the keys to be there to display data. While I love ACF and use it for everything, I also want to make sure that the client’s theme will continue to work should ACF get disabled for some reason. For this reason I’ve learned how to get all of the data I need using standard WP functions.
That being said, there is a plugin available that will import to ACF fields from a CSV, but it’s not free. http://www.wpallimport.com/ it has an ACF add on, http://www.wpallimport.com/add-ons/
