diff --git a/lib/models/api-key.js b/lib/models/api-key.js
index 8e40ec3..f736984 100644
--- a/lib/models/api-key.js
+++ b/lib/models/api-key.js
@@ -47,10 +47,14 @@ class ApiKey extends Model {
   }
 
   /**
-  * update last_used api key for an account
-  */
+   * update last_used api key for an account
+   * (only if last_used is null or more than a minute ago)
+   */
   static updateLastUsed(account_sid) {
-    const sql = 'UPDATE api_keys SET last_used = NOW() WHERE account_sid = ?';
+    const sql = `UPDATE api_keys 
+                SET last_used = NOW() 
+                WHERE account_sid = ? 
+                AND (last_used IS NULL OR last_used < NOW() - INTERVAL 1 MINUTE)`;
     const args = [account_sid];
 
     return new Promise((resolve, reject) => {