SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef21e25f8d63225376905d07fce2056bd55c9552d655695527744a77d7712e1' 
  AND token = 'FYmH0o8M7VZ/g8ByhhTOW3pqwfd5B7B3jLDl8wUxLr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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