SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cbe0f23c193cd5e1795cecd9e04f523937ae2b56ed29a7e19df883031243685' 
  AND token = 'knnXo/eCpBNiVcGuWoaFRL/Y/AoBIuqwz6745mK/QpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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