SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bfd251505651026d8084ee3ac4661bc39e600c1220e00209ca9e47570d37d51' 
  AND token = 'u/BdOsf60lCeJ/SWEUUoglHJjU+xHpCtbPqqZHGYlM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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