SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42d1f82dccb1bd329d6ea503a49c57dbd28d75225b9571a89762f8973e01bacc' 
  AND token = 'U3BQCgVJA1+bZNhZCvAhYYHllL5yt8D5YFhMh+9xcfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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