SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98956802bb9f8eaeefe3cd9fa843b323d36bc1db516cc627129eeac1690a464b' 
  AND token = 'WeDk/iHm0PG+sQMrZuRbUZxcDthT8XUeulzXT4zvJCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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