SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bed620950b86028175fd52e6a385b592f316428af1a243fbe0d229728c556fe3' 
  AND token = 'z+p9nM5Gwvnhw7ZPZGqwwur5X4YDaRno9zJG7dJ3URw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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