SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '832d43b29352638c7b35269a6f45fd3f6da4841b998ed39789ef7015166a5d26' 
  AND token = 'wlYw7u2VwhsFJLBDL9y3ro1nPqjpypISNoQw26/htWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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