Ensure that you have a good singing posture. Without a proper posture, the muscles around the throat are in a state of imbalance and cannot operate optimally.
Use the Bel Canto technique called "lifting." Assume a "pleasant facial expression" by gently using the cheek muscles in the same way that you would start a smile. This will help to strengthen these muscles and undo any incorrect tension that exists.
Inhale on a "K" sound. Form the inside of your mouth in the same way that you would if pronouncing the letter "K" and slowly breathe in. This helps in training you how to lift the soft palate.
Sing the vowel "uh." Practicing singing phrases with your mouth shaped in the "uh" position will help train the muscles around your pharynx--ensuring that it will stay in a low position.
Direct your focus away from the back of the throat. This tends to result in a "throaty" tone and produces unnecessary tension.