Yes, you can preschedule a ride with Lyft, but I always advise against it.
Lyft typically dispatches prescheduled rides way early, the driver responds to the pickup location, and you're not there because they arrived 30-60 minutes before you wanted them to pick you up. You get a $10 cancellation fee.
If you're going to be boarding a cruise, you won't need to leave WDW until mid-morning. There will be plenty of Lyft drivers around.
Lyft theoretically will advise the driver that you are requesting a long ride, but the info given is so limited that the driver won't really know what to expect. As soon as the ride is accepted, I suggest that you call the driver and explain your trip to them. If they ask you to, cancel quickly (so you don't get charged a cancellation fee) and submit the request again until you get someone to take it.
You might also research a one-way car rental or shuttle option. A one-way rental possibly could work out less expensive than a 70 mile Lyft trip.