SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a560cb7a51b07d4a3564edc20cc0b9d5348179b5b861b0e9b016f469a697606' 
  AND token = '2V6nYHIDgeqQRwnaDvsBhf8Xf+yznBQ+0ee+ELUhFhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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