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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0941857b5cd9c77080876e421f808a503ef84ffa6be5cf8667f8ddc5166df21' 
  AND token = 'Nk7cGznIuCeuGsOt0qRlMjHEDWNkoV3FxcC/VdFbPBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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