SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766019829cfbcb07a424341c56d083486852ad9617989e2617fb4655e3ef4c86' 
  AND token = 'fBrB46yLvH+lY8dk+3KSomKpF3x5+GAJubk3TMUINLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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