SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '560db85a972cafe16ae3844ff416f7f739027bc422be23efabd9c37640f1c83f' 
  AND token = 'yrZuN8+YYQAijeddiHp5gQtHwCxm4hSJqEN6veWA6U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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