SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55630bd1fba307d9626d353fca8ef7680a50d9a84b7ee0a5d65ec07c644172b4' 
  AND token = 'eJjBU/xZXUQIpKS6bVxXCpNxYPwBMMScehYv+pIJkGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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