SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f6b900423f01f0b88bbf3862cb770e39a62cc1a9cc2c86b080d533d6b4da79d' 
  AND token = 'wCvqEroM+t/alv2QjIFReuCUsGrfhKxuDtOFg5713Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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