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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96b9ff60082c3ab1d45423ab401b8075eadaafdd734d4205714bb06b1c416d71' 
  AND token = 'SasWmc6WpurHXPxgnPg7Wg4+DO3bRYpOkbEeI2nXFAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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