SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0159dfc9a0e48e3c239d38e03a66d98fcf744ea676b39dc8af56464dcb03a209' 
  AND token = 'PX9HlFYXyMYtz58mJ6vIOJmKA9YAQYnJGWQKs1LxR5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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