SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '694b028b74dac50b9dcd274cb508c33710fda4de9398852fab17fb840423de27' 
  AND token = 'An8sIkx9f1/zbn/BqLKX6fxRwB2mtVrU1mmCMltQUzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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