Hi there Shawn!
Old Key West resort offers two dinning options for you! There is the Good’s Food to Go which is listed as Quick Service and Olivia’s Cafe which is listed as Table Service. I've heard some good things about Olivia's Cafe but I don't know anything about Good's Food to Go. They are also both open for Breakfast, lunch, and dinner!
If you have Snack Credits left over at the end of the stay, you will need to stock up on snacks on the way home. I took a look at a menu for Good's Food to Go and they have some great snack offerings! It will make for some wonderful eating on the way home!
If you haven't taken a look at the Disney Dinning Plan information list, here is a
link which will help you out in finding restaurants to eat in while out and about in Walt Disney World! I hope this information helps you with your planning and if you have more questions, please ask away! We are always here to help! Have a Magical Time at the Walt Disney World Resort! Thanks so much for asking the Moms Panel!