SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eb8faef82b8b8bc79349d1afce240b1de56f99e143d79698a59c0ead4a187af' 
  AND token = '3qyJRYHihZgBuGGOL/xrfSyCQvu1fSDYDTgdo65FEHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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