SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce222ecc900b31943f14e3bae9784134065d53dac22bd2de36fdab029c3c4f4b' 
  AND token = 'Q+psAWYKsszfl2R85i4GYzQsZT8q2vT5j1JhCZJI3lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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