Keys is a 4-5 hour tour. There are a few different start times fot it (8:30am, 9am or 9:30am) You can arrange it by calling 407-939-8687 (They are open until 9pm I believe, might be 9:30pm).
Here is the info as well,
Unlock the door to the secrets behind the creation and growth of the Magic Kingdo on this 4 to 5-hour walking tour. Enjoy stops backstage and at favorite attractions as you discover the remarkable history of the Park and hear intriguing stories about Walt Disney, his visions, philosophies and amazing accomplishments.
Location and Time: Everyday at 8:30, 9:00 & 9:30am. Tour starts at Guided Tour Garden adjacent to City Hall just inside the Magic Kingdom Main Entrance. Guests should arrive at least 15 minutes prior to start time.
Duration: 4 - 5 hours
Cost: $58.00 per person with lunch included (Theme park admission is required.)
Restrictions: Guests must be at least 16 years old to attend this program. Please advise guests this is an outdoor walking program. Guests are required to have a photo ID in their possession during the program. Large bags and cameras are NOT permitted.
Discounts:
DVC & Annual Passholders: 15%
Packages:
Bronze/Silver, Gold, and Platinum Plans