SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fe6c3095da42b57351484a96269013aa92cc72aa2bc600c504c2b4dfa421066' 
  AND token = 'EbLWJg7gvNnbJqSUGiZiX5PfBQxAQiAj/NjBXM6YtJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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