SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f45844f205fc02f5217913f3d08e6b1aa7f3d67d1fb241938c614f3dc660ca2' 
  AND token = 'LZ5xq8S8C61+uqy7jEX7IUhK0mFo3F2JOtz6dzQo2Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}