Keyed interface connector

FIG. 1 is a front perspective view of an ornamental design for a keyed interface connector;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof.

FIG. 5 is a rear view thereof;

FIG. 6 is a first side view thereof; and,

FIG. 7 is a second side view thereof.

The broken lines shown in FIG. 1-FIG . 7 are included for the purpose of illustrating environmental elements only and form no part of the claimed design.