SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09d1cd757d0b88769a6f0b60435675a45556afa4e28afae5877467c91b176f0b' 
  AND token = 'rUoFZc6KAP6Zvv4F/BxsnhGUgEwUkyeq4Wyh7pvCvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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