SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '177bbf15980ae800b43c22b7293445c572517fc3f72d2131626a4ed01831a048' 
  AND token = '+Vq+3HAzuNdmPj421IVhrJgPNcVXwLwVcpBOTWWDtHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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