SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44712e3d85d350e52b5f4b8f49935a863c07c9e879bbcdd4694d2dd776b66e9d' 
  AND token = 'T/EHg6o+dIA0wSAygztsBk3u7m+xQaPjFYHJo2v6qvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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