SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8b8e1f338916a5c89bc7f7129b556f8e6d7b003330d5b0b8ff1a6470190c97' 
  AND token = 'z9/IgHsoZ2htNdZeX8iJoQ5HlBWfiHR57+LTUhD/WYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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