SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '127e3d61e495320e9a02ee4b0a4060d1f327c7b6b3f61aa924afd8a88ffa90bd' 
  AND token = 'TLP8YKv3Y9Y2lXuoZrpluHkhzT/k30MNvKNwJTA5Bvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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