SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589411be631d8e4f1b871ecda4d075bcf5dc37677586139da616f4d80c72f720' 
  AND token = 'JUX+Kyz7kyG6r24enQNJAjhXMySP10shuSlQ3LGQv/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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