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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68e36299b8467545a57b3b14f02b18a44badeca9af63b5ef610eb011a9a44db4' 
  AND token = 'w+YK9FD/iSp9Nsnvsy41l/qJexm5VgT9Nk8s+Hhd9yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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