SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '642301b2748cdf16a9ddc189b4ba37007a683a0a943bd803308ca9019a666663' 
  AND token = 'Yj7WoS+LD4q3J1sOHcCD0HuywQX/MXBp5qF5+MzNmlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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