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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23592f0376791edf96045a593119a8848280dea864c3e39181d9deca314c6020' 
  AND token = 't58pyYJiOpb3RPqsba73a7q+hiCVvGO9hGSwAqYr0V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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