The ornamental design for a heart-shaped keychain, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a left side elevational view of a heart-shaped keychain showing my design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a bottom elevational view thereof;
FIG. 4 is a top elevational view thereof;
FIG. 5 is a front plan view thereof;
FIG. 6 is a rear plan view thereof;
FIG. 7 is a front perspective view thereof; and,
FIG. 8 is a front perspective view thereof with light emanating from within the heart-shaped body of the keychain.