SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd664cf65a371db9b71c6d3fc8c722c1e3fb4022da01f72530fce66aebda93209' 
  AND token = 'G7o2vJaZ8ogSdz0jqmBYyEh/rt6KfyTfn2mqNAIOWdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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