SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e46ba4cd460b74beb9276838e141ca829ffb13cb1cb876ddbfd6655f5192e8e' 
  AND token = 'ZihWGbsq7RyIxzgcT91KSwlopoPc9hX/mvX/6CdbQ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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