SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '509b474a6c308248c3e646bfb91f7e76fdbb7629bbcf8afb998c25680c164c4f' 
  AND token = 'fWu2UzZrlvKtlIOV/qydqanlUSBOHLsdRSNh8UG6eLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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