SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4649e9c98c85bb278054600c1e1e8ac393bf8fb046dfb31b831eb050f455d564' 
  AND token = 'Udtj+SgXvk1LmJVHxtb5Bzlok0Sxg+M7Gqim0sKkwCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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