Key card at the Swan & Dolphin for now.
But you can still download the Bonvoy app to your Smartphone. They support Mobile Check-in where you will get a Txt when your room(s) are ready. You can also use the Bonvoy app to chat with hotel staff for more service items for your room or other "on site" questions?
https://mobile-app.marriott.com/en-us#check-in
The Bonvoy app is able to open your hotel room door at select properties but the Swan & Dolphin have not been upgraded with this new door technology as of today.
There is also the handy Walt Disney World Swan & Dolphin app for Android and Apple that provides resort information on transportation, restaurant hours, menus, and for those options that take reservations: link to Open Table to book online or phone number.
Dave