SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6986adbc27125fffc478f13c306567ec3c975375f1988ebe204dbb7052c0553b' 
  AND token = 'UJHObz9Nnk7GQprpy6xBD8vVhiQh1SWV58Z/CTrXCDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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