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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16ef5c3cd0bf37fea27a3ec9befa8484886b3cfe91324d1672deb21ff6119193' 
  AND token = 'zbipKvCt9KHHoOHT6s08/0XHDQ7+noYxZxRpdHJma6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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