SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64e648304ac9d1034c9d725685572cca323ba7ff6c901e69bc429a44b7a6b972' 
  AND token = 'z2GQo0clMExzzZrJ1lMGgealPmqLAxXF5Y8iVzqUhTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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