Добавлены индексы перед попыткой создать ключи

console/migrations/m160127_082148_trigger_scenario.php

@@ -31,6 +31,7 @@ class m160127_082148_trigger_scenario extends Migration
                 'date_create' => Schema::TYPE_DATETIME.' NOT NULL'
             ]
         );
+        $this->createIndex('index_scenario_owner_id', 'trigger_scenario', 'owner_id');
         $this->addForeignKey(
             'fk_scenario_owner_id_users_id',
             'trigger_scenario', 'owner_id',
@@ -41,6 +42,7 @@ class m160127_082148_trigger_scenario extends Migration
     public function safeDown()
     {
         $this->dropForeignKey('fk_scenario_owner_id_users_id', 'trigger_scenario');
+        $this->dropIndex('index_scenario_owner_id', 'trigger_scenario');
         $this->dropTable('trigger_scenario');
     }
 }