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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dffd737b8f4a590e0f85c50c402cae6411fc9f3aa89ea07ca1bf31b110c0f09f' 
  AND token = 'ZA9O53sGWfsROoXBmND9ksNyF+jTPcC20uYecTw2bMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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