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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf33650ecad4be4ac17abf48cb4957ecc373955932d3c4d15e0d983b176b37b' 
  AND token = 'yDlEF8K8/ZPByZqsinlx6Dv3VMbxJ4Eq7y2nu+IKoBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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