SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e22024202192b36655a97480ad1c35dcb8c0c40f572f369668df6f2577c0279' 
  AND token = 'vmLlnyPUWNHaE+ZXbkMuD/BpkAnDFHR193ij4DNBy/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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