SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00ce3e1ea6adf9fe6dc7304d9be2559be5a62e43ab87d5fed8f2ae97ce7a8a45' 
  AND token = 'qLeLByJvTF/zddmZAh0Zr+thFeQUgGhE1ODjb3CG7Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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