SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd18d95f095b7c2c3afba5d2e3664c712dc0a57c31b45fedfe5b53c53828df072' 
  AND token = 'l/0VZtc4JQ1yAzBLXstWzmuQAPYbpfF2hi1K/6s3m6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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