SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd345bbe2aa4a207670ff7c09387fdb9880825a450d0e6ce5faaf3a169b3cd810' 
  AND token = 'vTsUmy8aHugVsGtoZIsYIBFcyKRf5CXiJhS9rszwLlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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