SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cfd205dca63207044678dd0db4a785a1dbe96f1f6d044109299c73cb3cbdc38' 
  AND token = '+K9Xg7oIgmzetsjwv69MCawqI5mXzvAwFJjoj8Pa4XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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