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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e0c861fe910d0d38f42e5513e04e7e84dffd222a553b0a458c295d2ca460a3' 
  AND token = 'TXK5oZ8h1b2pY1l44UI1C1aoNvH8D7QMarkNUqrxVvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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