First-half goals from Kevin Sainte-Luce and Jack Midson saw the Dons move seven points clear of the drop.
Despite seeing his side move up to 16th place in the table with the 2-0 win, Ardley insists there is still plenty of work to be done.
"We're nearly clear of relegation, but nearly is not good enough so we've got to keep pushing on - it's a strange league this year and I'm sure it will go down to the wire," said the Dons boss.
"It was a strange game. On Friday I was really concerned after training, the players looked very leggy and were mentally and physically tired - they were lifeless.
"After the first 30 minutes I was hoping we could come in at half-time with the score still 0-0. Fair play to Morecambe, they passed the ball well and were by far the better team for the first half an hour.
"We changed the tactics after the break and it was a thoroughly professional second half performance that never looked in doubt."
Ardley added: "We just want to get points on the board as quickly as we can because I don't want to be looking over my shoulder with two games to go, we want to put it to bed ASAP so we can look forward and get the team to express themselves."