SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66a92bcd176d7e714a426617044a88170f42e06258553495a5a92a6703e920ee' 
  AND token = 'IgDUbUdCsBz560rVhZluJnpjs7pz1ndCp4j6HwQJoXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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