SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db0774566c8acb0e972748ffc18bb2226e262e892fb1fd1af8d32ab42d481d33' 
  AND token = 'mHDx6WBjqt0mvfVSQn3UuZY2VHmZZ3LJ6aFGskENNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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