SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '859759090f5103f3ff5fcc9e8469f7769840545f27217284b92afe1a868a80b9' 
  AND token = '1H95C6PbzCyGKqLvR51PHJN60MvfSGPfUSxZcmhYq+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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