SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '247fb4acbf4b999ecbc8ed6a50e7f5a9ec076042cc472e5286d2f8bf349ca1cd' 
  AND token = 'G3h6X/wwycRNLmeBCsj0GdAXJV+HqHl4aojuOAC5Hn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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