SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af55cc7133a67f1d2ee94d9baed37f1c7a2fd1098c81248b2082f79640f52513' 
  AND token = 'YpktKoojIPaB0OEcV+1lNngYkBNNt2ohN6omRJBz9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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