SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ec991f8bfd1455739a756250a5c662121cecb42b0df0d5dd99fa4f33ba5858e' 
  AND token = 'qVwRwyARvpJ+ZM0pma1mVs8jnqKivzF/5nC+OFNi27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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