SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5999cf2af607d57d26fa87f0225ca11f5c44ed11893ef346a0d99a85f1e99f' 
  AND token = '7QC7KBQw/lJ0YG465hsFWy6BAs0TCSKfKPcgqebcnx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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