SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f78e47e40f8f353d140905b16faed6c5b378c94c2fc8e75b9f6d9e42b4731ff' 
  AND token = 'xmxX/voyJlJoDjPmcpWbGbFcEiUG3zD6mptdVKyFO6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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