Crust

1 1/2 cups graham cracker crumbs

3 tablespoons sugar

1/4 teaspoon salt

6 tablespoons (3/4 stick) unsalted butter, melted

Filling

1 (14-ounce) can sweetened condensed milk

2/3 cup bottled Key lime juice

3 large egg yolks

3 tablespoons sugar

3 tablespoons fresh lemon juice

1/4 teaspoon salt

Topping

1 1/2 cups chilled whipping cream

3 tablespoons powdered sugar

1 teaspoon vanilla extract