SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1df38e779ca43f4d02826140afafc420579c200f081d41b948925fa1b7f586d1' 
  AND token = 'iyUbEj9K/4w6mD/uDgD7wyP65IMq7KJmSVJBLKtQh/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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