SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4b2466326a6a4d016ace178dc4af6082b6c9f55bc98ff4b4af0bdb5e736023b' 
  AND token = 'dYBvL6rTH/4uSyuLZqIu8CmTp7ze2iPzHEcM+90J3DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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