SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1acc6619572fff1f6e191cbdc23289a8775557bb9270b3dc474d984cfce7da3d' 
  AND token = '9G65HYMJzr/0en8PGMhGCE6a8/xzSi10OBufApXhw94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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