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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '348f0d9ae171cc25d23d10b3cc66bf4cd9054b9e4cb00fccb7d692c4c73b27a4' 
  AND token = 'padJnscmZqy68z1yGz0rdhHOYIkiKmROgSQFBADL8R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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