The Cobblers moved back up to within one point of the top three in League Two with a 2-0 success against Accrington thanks to first half goals from Chris Hackett, his sixth of the season on his return, and Roy O'Donovan.
Boothroyd said: "I thought we deserved all three points, especially in the first half when Roy O'Donovan and Clive Platt were unplayable.
"Roy has given us another dimension in attack and that's example of how strong our squad is. The quality on the bench shows how strong we are on the pitch.
"Chris [Hackett] needed a rest, he looked a bit rusty, but he's come back with a great goal. He's been brilliant all season and I don't want to burn him out when we really need him.
"It's the same with Bayo [Akinfenwa]. I don't want to risk players when we don't need to. We've got a tight group of players here, but one which is prepared to work from one another, even though they might not always be in the starting line-up.
"It's another three points but we know we'll have to play a lot better than that. We got the first goal which was important for us but we didn't play that well in the second half, although it was nice to keep another clean sheet.
"Accrington had nothing to lose in the second half and it took some decent saves from Lee Nicholls for us to keep a clean sheet."