SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29e7ed861fe40509d5e6c1a05dedc1b725b07629b7bc8d48def586173cd832e0' 
  AND token = 'Vh/TDPfLFwrnqYvbdKBOuyxyqECM3i2QJL87szSJ28Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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