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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b39f3303afe4f0881aa08337a47b271707d55b9ab8f0698d5f0a0a72ea8341' 
  AND token = 'PuwpeDP7SKs6T24tMm/40qCF7XgN/XSoQ68bEhxza00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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