SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b4b3fd79669774f3b7e07e849d2770122bbe4bec40fc9b5c116c87eeac8924a' 
  AND token = 'Eg0i8KJyQfWP0PnSBabUChzwGzQbFl9lqggG8LnuXHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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