SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '727cb83f8e241762c116056a7eda6e08f12a86e3a40f06e58620bad70a4f9d7e' 
  AND token = 'WvzlKVvZTLZ80pAXT7wKTtuDjeGsjnUom7Y9lwgi0xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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