SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ce90265003d2b7039810a7fb5f4c84a36a1e377c4a0e01ed9b5576f8a741e4d' 
  AND token = 'xFaLuLs5NqG06G6Oc2SF/HOHgFgoljel3oVhuhCwpvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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