SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a22be8bc4230795e3f4785e8b70a010faa92714b6d8d00ca51827a5ab88147b' 
  AND token = 'AW0JLjYTofQPQHmlHwOdrPfnOGVwioqd2G5REf+3hZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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