Preheat your oven to 350°F (175°C).
In a mixing bowl, combine graham cracker crumbs, sugar, and melted butter until well mixed.
Press the mixture into the bottom and up the sides of a 9-inch pie dish.
Bake the crust for 10 minutes, then remove from the oven and let it cool slightly.
In another bowl, whisk together the egg yolks and condensed milk until smooth.
Gradually add the key lime juice, whisking until well combined.
Pour the filling into the cooled crust.
Bake for 15 minutes, or until the center is set but still slightly jiggly.
Let the pie cool completely at room temperature, then refrigerate for at least 2 hours before serving.